Near-field imaging of the multi-resonant mode induced broadband tunable metamaterial absorber.
Near-field imaging of the multi-resonant mode induced broadband tunable metamaterial absorber.
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多谐振模式诱导宽带可调谐超材料吸收器的近场成像
作者：
具有可调性的超材料吸收材料在中红外吸收中具有广阔的应用前景。虽然已经提出了各种控制吸收的方法，但如何深入分析和呈现吸收机制的物理图像仍然是值得期待和有意义的。本文利用近场光学显微镜研究了多共振模式诱导宽带可调谐超材料吸收体的实验空间近场分布。吸收器由一个金属双尺寸单元电池和一个金属反射镜组成，反射镜由一个薄的Ge2Sb2Te5 （GST）间隔片隔开。为了清晰地获得物理图像，我们使用了由四个方形谐振腔组成的混合单元电池，在7.8 μm和8.3 μm处产生了两个吸收峰。当GST薄膜从非晶相切换到晶相时，共振中心波长发生红移。当GST处于两个相位时，吸收器的近场振幅和相位光学响应分别在吸收频率下直接观察到。这项工作将为基础科学领域铺平道路，并激发光可调谐吸收控制的潜在应用。
Metamaterial absorbers with tunability have broad prospects for mid-infrared absorption applications. While various methods have been proposed to control absorption, how to analyse and present the physical image of absorption mechanism in depth is still expected and meaningful. Here, we present experimental spatial near-field distributions of a multi-resonant mode induced broadband tunable metamaterial absorber by using near-field optical microscopy. The absorber is constructed by a metal double-sized unit cell and a metallic mirror separated by a thin Ge2Sb2Te5 (GST) spacer. To clearly obtain the physical images, we used a hybrid unit cell consisting of four square resonators to produce two absorption peaks at 7.8 μm and 8.3 μm. The resonance central-wavelength exhibits a redshift while switching the GST thin film from amorphous to crystalline phase. The near-field amplitude and phase optical responses of the absorber are directly observed at absorption frequencies when GST is in both phases, respectively. This work will pave the way for the fundamental science field and inspire potential applications in optical tunable absorption control.
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影响因子：
3.8
作者：
Qu, Yurui;Cai, Lu;Li, Qiang
通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
17.1
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Cryan, Martin J.